public bool WaitOnBehalf(Process aProcess, Thread aThread)
{
ulong identifier = ((UInt64)aProcess.Id << 32) | aThread.Id;
ExclLock.Enter();
bool notLocked = count > 0;
if (notLocked)
{
count--;
}
else
{
aThread._EnterSleep(Thread.IndefiniteSleep);
WaitingThreads.Add(identifier);
}
ExclLock.Exit();
return(notLocked);
}
public static void Main()
{
// The serial ports should have already been initialised
MsgPort = Serial.COM2;
NotifPort = Serial.COM3;
// This looks silly, but the host debugger is actually waiting for this
// to determine the OS has connected and is ready
MsgPort.Write("Debug thread :D\n");
//MsgPort.Write("Enabling...\n");
// Everything is initialised and connected, so enable the debugger
Enabled = true;
//MsgPort.Write("Enabled.\n");
// Note: It doesn't actually matter if the host hasn't connected
// because the debugger has near-zero effective cost to the rest of the system
// unless it is sent a command (unlike the old debugger, which slowed everything
// down to the point of being unusable).
while (!Terminating)
{
// Read in a line from the host
FOS_System.String line = "";
char c = (char)MsgPort.Read();
while (c != '\n' && c != '\r')
{
line += c;
c = (char)MsgPort.Read();
}
// Echo the command back to the host for verification
MsgPort.Write("START OF COMMAND\n");
MsgPort.Write(line);
MsgPort.Write("\n");
// Filter the line
line = line.Trim().ToLower();
// Split it up into relevant parts
List lineParts = line.Split(' ');
if (lineParts.Count > 0)
{
FOS_System.String cmd = (FOS_System.String)lineParts[0];
if (cmd == "ping")
{
MsgPort.Write("pong\n");
}
else if (cmd == "help")
{
#region Help
MsgPort.Write("Available commands:\n");
MsgPort.Write(" - ping\n");
MsgPort.Write(" - threads\n");
MsgPort.Write(" - suspend (processId) (threadId | -1 for all threads)\n");
MsgPort.Write(" - resume (processId) (threadId | -1 for all threads)\n");
MsgPort.Write(" - step (processId) (threadId | -1 for all threads)\n");
MsgPort.Write(" - ss (processId) (threadId | -1 for all threads)\n");
MsgPort.Write(" - sta (processId) (threadId | -1 for all threads) (address)\n");
MsgPort.Write(" - bps (address:hex)\n");
MsgPort.Write(" - bpc (address:hex)\n");
MsgPort.Write(" - regs (processId) (threadId)\n");
MsgPort.Write(" - memory (processId) (address:hex) (length) (units:1,2,4)\n");
#endregion
}
else if (cmd == "threads")
{
#region Threads
for (int i = 0; i < ProcessManager.Processes.Count; i++)
{
Process AProcess = (Process)ProcessManager.Processes[i];
MsgPort.Write(" - Process : ");
MsgPort.Write((FOS_System.String)AProcess.Id);
MsgPort.Write(" : ");
MsgPort.Write(AProcess.Name);
MsgPort.Write(" : ");
switch (AProcess.Priority)
{
case Scheduler.Priority.ZeroTimed:
MsgPort.Write("Zero Timed");
break;
case Scheduler.Priority.Low:
MsgPort.Write("Low");
break;
case Scheduler.Priority.Normal:
MsgPort.Write("Normal");
break;
case Scheduler.Priority.High:
MsgPort.Write("High");
break;
}
MsgPort.Write("\n");
for (int j = 0; j < AProcess.Threads.Count; j++)
{
Thread AThread = (Thread)AProcess.Threads[j];
MsgPort.Write(" - Thread : ");
MsgPort.Write((FOS_System.String)AThread.Id);
MsgPort.Write(" : ");
switch (AThread.ActiveState)
{
case Thread.ActiveStates.Active:
MsgPort.Write("Active");
break;
case Thread.ActiveStates.Inactive:
MsgPort.Write("Inactive");
break;
case Thread.ActiveStates.NotStarted:
MsgPort.Write("Not Started");
break;
case Thread.ActiveStates.Suspended:
MsgPort.Write("Suspended");
break;
case Thread.ActiveStates.Terminated:
MsgPort.Write("Terminated");
break;
}
MsgPort.Write(" : ");
MsgPort.Write(AThread.Name);
MsgPort.Write("\n");
}
}
#endregion
}
else if (cmd == "suspend")
{
#region Suspend
if (lineParts.Count == 3)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
int ThreadId = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[2]);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
if (ThreadId == -1)
{
for (int i = 0; i < TheProcess.Threads.Count; i++)
{
Thread AThread = ((Thread)TheProcess.Threads[i]);
if (AThread != MainThread)
{
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | AThread.Id;
if (ThreadsToSuspend.IndexOf(ProcessThreadId) == -1)
{
ThreadsToSuspend.Add(ProcessThreadId);
}
AThread.Debug_Suspend = true;
MsgPort.Write(" > Suspended ");
MsgPort.Write(AThread.Name);
MsgPort.Write(" thread\n");
}
}
}
else
{
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | (uint)ThreadId;
if (ThreadsToSuspend.IndexOf(ProcessThreadId) == -1)
{
ThreadsToSuspend.Add(ProcessThreadId);
}
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
if (TheThread != MainThread)
{
TheThread.Debug_Suspend = true;
MsgPort.Write(" > Suspended ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" thread\n");
}
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "resume")
{
#region Resume
if (lineParts.Count == 3)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
int ThreadId = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[2]);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
if (ThreadId == -1)
{
for (int i = 0; i < TheProcess.Threads.Count; i++)
{
Thread AThread = ((Thread)TheProcess.Threads[i]);
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | AThread.Id;
ThreadsToSuspend.Remove(ProcessThreadId);
AThread.Debug_Suspend = false;
MsgPort.Write(" > Resumed ");
MsgPort.Write(AThread.Name);
MsgPort.Write(" thread\n");
}
}
else
{
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | (uint)ThreadId;
ThreadsToSuspend.Remove(ProcessThreadId);
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
TheThread.Debug_Suspend = false;
MsgPort.Write(" > Resumed ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" thread\n");
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "step")
{
#region Step
if (lineParts.Count == 3)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
int ThreadId = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[2]);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
if (ThreadId == -1)
{
for (int i = 0; i < TheProcess.Threads.Count; i++)
{
Thread AThread = ((Thread)TheProcess.Threads[i]);
if (AThread.Debug_Suspend)
{
AThread.Debug_Suspend = false;
MsgPort.Write(" > Stepping ");
MsgPort.Write(AThread.Name);
MsgPort.Write(" thread\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
}
else
{
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
if (TheThread.Debug_Suspend)
{
TheThread.Debug_Suspend = false;
MsgPort.Write(" > Stepping ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" thread\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "ss")
{
#region Single Step
if (lineParts.Count == 3)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
int ThreadId = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[2]);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
if (ThreadId == -1)
{
for (int i = 0; i < TheProcess.Threads.Count; i++)
{
Thread AThread = ((Thread)TheProcess.Threads[i]);
if (AThread.Debug_Suspend)
{
// Set trap flag (int1)
AThread.EFLAGSFromInterruptStack |= 0x0100;
AThread.Debug_Suspend = false;
MsgPort.Write(" > Single stepping ");
MsgPort.Write(AThread.Name);
MsgPort.Write(" thread\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
}
else
{
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
if (TheThread.Debug_Suspend)
{
// Set trap flag (int1)
TheThread.EFLAGSFromInterruptStack |= 0x0100;
TheThread.Debug_Suspend = false;
MsgPort.Write(" > Single stepping ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" thread\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "sta")
{
#region Step To Address
if (lineParts.Count == 4)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
int ThreadId = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[2]);
uint Address = FOS_System.Int32.Parse_HexadecimalUnsigned((FOS_System.String)lineParts[3], 0);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
if (ThreadId == -1)
{
for (int i = 0; i < TheProcess.Threads.Count; i++)
{
Thread AThread = ((Thread)TheProcess.Threads[i]);
if (AThread.Debug_Suspend)
{
// Set trap flag (int1)
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | (uint)ThreadId;
ThreadsToSuspendAtAddresses.Add(ProcessThreadId, Address);
AThread.EFLAGSFromInterruptStack |= 0x0100;
AThread.Debug_Suspend = false;
MsgPort.Write(" > Single stepping ");
MsgPort.Write(AThread.Name);
MsgPort.Write(" thread to address ");
MsgPort.Write(Address);
MsgPort.Write("\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
}
else
{
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
if (TheThread.Debug_Suspend)
{
// Set trap flag (int1)
UInt64 ProcessThreadId = (((UInt64)ProcessId) << 32) | (uint)ThreadId;
ThreadsToSuspendAtAddresses.Add(ProcessThreadId, Address);
TheThread.EFLAGSFromInterruptStack |= 0x0100;
TheThread.Debug_Suspend = false;
MsgPort.Write(" > Single stepping ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" thread to address ");
MsgPort.Write(Address);
MsgPort.Write("\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "bps")
{
#region Set Breakpoint
if (lineParts.Count == 2)
{
uint Address = FOS_System.Int32.Parse_HexadecimalUnsigned((FOS_System.String)lineParts[1], 0);
MsgPort.Write(" > Breakpoint to be set at ");
MsgPort.Write(Address);
MsgPort.Write("\n");
*((byte *)Address) = 0xCC;
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "bpc")
{
#region Clear Breakpoint
if (lineParts.Count == 2)
{
uint Address = FOS_System.Int32.Parse_HexadecimalUnsigned((FOS_System.String)lineParts[1], 0);
MsgPort.Write(" > Breakpoint to be cleared at ");
MsgPort.Write(Address);
MsgPort.Write("\n");
*((byte *)Address) = 0x90;
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "regs")
{
#region Registers
if (lineParts.Count == 3)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
uint ThreadId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[2], 0);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null)
{
Thread TheThread = ProcessManager.GetThreadById((uint)ThreadId, TheProcess);
if (TheThread != null)
{
if (TheThread.Debug_Suspend)
{
MsgPort.Write("Registers of ");
MsgPort.Write(TheThread.Name);
MsgPort.Write(" : \n");
MsgPort.Write(" > EAX : ");
MsgPort.Write(TheThread.EAXFromInterruptStack);
MsgPort.Write("\n > EBX : ");
MsgPort.Write(TheThread.EBXFromInterruptStack);
MsgPort.Write("\n > ECX : ");
MsgPort.Write(TheThread.ECXFromInterruptStack);
MsgPort.Write("\n > EDX : ");
MsgPort.Write(TheThread.EDXFromInterruptStack);
MsgPort.Write("\n");
MsgPort.Write("\n > ESP : ");
MsgPort.Write(TheThread.ESPFromInterruptStack);
MsgPort.Write("\n > EBP : ");
MsgPort.Write(TheThread.EBPFromInterruptStack);
MsgPort.Write("\n > EIP : ");
MsgPort.Write(TheThread.EIPFromInterruptStack);
MsgPort.Write("\n");
}
else
{
MsgPort.Write("Thread must be suspended first.\n");
}
}
else
{
MsgPort.Write("Thread not found.\n");
}
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else if (cmd == "mem")
{
#region Memory
if (lineParts.Count == 5)
{
uint ProcessId = FOS_System.Int32.Parse_DecimalUnsigned((FOS_System.String)lineParts[1], 0);
Process TheProcess = ProcessManager.GetProcessById(ProcessId);
if (TheProcess != null && false)
{
// Need access to specified process' memory
//TODO: Erm... MemoryLayout OriginalMemoryLayout = SystemCallsHelpers.EnableAccessToMemoryOfProcess(TheProcess);
uint Address = FOS_System.Int32.Parse_HexadecimalUnsigned((FOS_System.String)lineParts[2], 0);
int length = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[3]);
int units = FOS_System.Int32.Parse_DecimalSigned((FOS_System.String)lineParts[4]);
MsgPort.Write(" Memory from ");
MsgPort.Write(Address);
MsgPort.Write(" for ");
MsgPort.Write(length);
MsgPort.Write(" units with ");
MsgPort.Write(units);
MsgPort.Write(" bytes/unit:\n");
if (units == 1)
{
byte *AddrPtr = (byte *)Address;
for (int i = 0; i < length; i++)
{
MsgPort.Write((FOS_System.String)AddrPtr[i]);
MsgPort.Write(" ");
}
}
else if (units == 2)
{
ushort *AddrPtr = (ushort *)Address;
for (int i = 0; i < length; i++)
{
MsgPort.Write((FOS_System.String)AddrPtr[i]);
MsgPort.Write(" ");
}
}
else if (units == 4)
{
uint *AddrPtr = (uint *)Address;
for (int i = 0; i < length; i++)
{
MsgPort.Write((FOS_System.String)AddrPtr[i]);
MsgPort.Write(" ");
}
}
MsgPort.Write("\n");
//TODO: Erm... SystemCallsHelpers.DisableAccessToMemoryOfProcess(OriginalMemoryLayout);
}
else
{
MsgPort.Write("Process not found.\n");
}
}
else
{
MsgPort.Write("Incorrect arguments, see help.\n");
}
#endregion
}
else
{
MsgPort.Write("Unrecognised command. (Note: Backspace not supported!)\n");
}
}
// Always issue end of command signal, even if something else went wrong
// - Keeps the host in sync.
MsgPort.Write("END OF COMMAND\n");
}
}